ABSTRACT

From the observation of micropreparations of diatoms of epiphytic habits, deposited as reference material in the collection of macroalgae Germán Bula-Meyer, from the Centro de Colecciones Biológicas de Universidad del Magdalena, we obtained the first record of the benthic diatom Chrisanthemodiscus floriatus Mann 1925, (Chrysanthemodiscaceae), to the Colombian Caribbean, in the Bay of Cinto in the Tayrona National Park , Magdalena-Colombia; its distribution known so far was in the northern hemisphere between 5 and 30°


KEY WORDS: Colombian Caribbean, Chrysanthemodiscus floriatus, Diatoms

RESUMEN

A partir de la observación de micropreparados de diatomeas de hábitos epifíticos, depositados como material de referencia en la colección de macroalgas Germán Bula-Meyer, del Centro de Colecciones Biológicas de la Universidad del Magdalena, se obtuvo un primer registro de la diatomea bentónica Chrisanthemodiscus floriatus Mann 1925, (Chrysanthemodiscaceae), para el Caribe colombiano, en la Bahía de Cinto en el Parque Nacional Natural Tayrona, Magdalena-Colombia; su distribución conocida hasta el momento era en el hemisferio Norte entre los 5 y 30°

PALABRAS CLAVE: Caribe colombiano, Chrysanthemodiscus floriatus, Diatomeas.

The diatom Chrysanthemodiscus floriatus is recorded for first time for the Caribbean coast of Colombia. The sample was collected at Bahía Cinto (Tayrona National Park, Magdalena) by the late Professor German Bula on October 15, 1981. The sample was labeled with the number 470 and stored in a glass jar in his personal collection. The specimens were mounted in Canada balsam and identified with the numbers 177a and 177b, and according to his notes, correspond to the benthic diatoms, epiphytes on thalli of Heterosiphonia. Currently, the material is deposited in the Centro de Colecciones de la Universidad del Magdalena (CBUMALG). Photographic records were obtained using a Zeiss Axiocam ERc5S digital camera and a Zeiss AxioLab-A1 microscope with phase contrast.

The cylindrical cells organized in long chains with hyaline frustules, numerous girdle bands, convex valves, and their sizes (Table 1, Fig. 1), confirmed that the specimens belong to C. floriatus Mann 1925: Mann, 1925, p. 58, pl. 13, fig. 1; Round, 1978, pp. 157-161, figs. 1-15; Gibson and Navarro, 1981, pp. 338-341, figs. 1-9; Navarro et al., 1989, p. 337; Round et al., 1990, pp. 152-153, figs. A-I. C. floriatus is a marine epiphyte diatom that forms colonies by means of mucilage pads arising from the valves. This species is associated to macroscopic algae along the tropical coasts (Round et al., 1990).

Initially, C. floriatus was classified in the class Bacillariophyceae, order Centrales, suborder Biddulphiinea, family Biddulphiaceae, subfamily Stictodiscoideae (Simonsen, 1979, p. 28; Navarro et al., 1989). Currently, C. floriatus belongs to the class Coscinodiscophyceae, order Chrysanthemodiscales, family Chrysanthemodiscaceae (Round, 1978; Round et al., 1990; Navarro and Hernández-Becerril, 1997).

In the Caribbean, this species has been recorded for Isla Caja de Muertos in Puerto Rico (Navarro et al., 1989). Herein, we expand its geographic distribution to the Colombian Caribbean coast. C. floriatus is also reported in the continental shelf and slope of the east coast of Florida near to West Palm Beach (Gibson and Navarro, 1981). In the Pacific, it has been found in Oahu, Hawai (Round, 1978); Philippines (Mann, 1925) and Japan (mentioned in Round et al., 1990). In the Indian Ocean, in the coast of Oman (mentioned in Round et al., 1990).

Although, there are few records of C. floriatus worldwide, it is possible that this species has a wider distribution. The few records of benthic marine diatoms may be due to the limited number of studies that study these species, as well as the fragility of these diatoms and the transparence of their frustules (figs. 1A and 1B), could explain the existence of only few records.

BIBLIOGRAFÍA

Gibson, R.A. and Navarro J.N. 1981. Chrysanthemodiscus floriatus (Bacillariophyceae) a new record for the Atlantic Ocean with comments on its structure. Phycologia 20(4): 338-341.

Mann, A. 1925. Marine diatoms of the Philippine Islands. Contributions to the biology of the Philippine Archipielago and adjacent regions. Smitsonian Institution. Unit. Stat. Nat. Mus. 100(6), part, 1.

Navarro, J.N and Hernández-Becerril D.U. 1997. Listados florísticos de México. XV. Check list of marine diatoms from the Caribbean Sea. UNAM. Edit. Cromacolor. Mexico D.F.

Navarro, J.N., Pérez, C., Arce, N. and Arroyo, B. 1989. Benthic marine diatoms of Caja de Muertos Island, Puerto Rico. Nova Hedwigia 49(3-4): 333-367.

Round, F.E. 1978. The diatom genus Chrysanthemodiscus Mann (Bacillariophyta). Phycologia 17(2): 157-161.

Round, F.E., Crawford, R.M. and Mann, D.G. 1990. The Diatoms, biology and morphology of the genera. Cambridge University Press.

Simonsen, R. 1979. The Diatom System: Ideas on Phylogeny. Bacillaria 2: 9-72.

Fecha de recepción: 12/03/2015
Fecha de aceptación: 27/05/2015

Para citar este artículo: Vidal, L.A., S. Quiroga, R. García-Urueña. 2015. First record of the diatom Chrysanthemodiscus floriatus Mann 1925, (Chrysanthemodiscaceae) In the Caribbean Coast Of Colombia. Revista Intropica Vol. 10: 100 - 102